“We’re going to have to put in place a very comprehensive and robust strategy”

"But we can't kill our way out of this mess. We're going to have to put in place a very comprehensive and robust strategy to help the — the world of Islam and other parts of the world, reject this radical violent extremism, which is — it's certainly not on the run... It's certainly not hiding. This is a group that is now involved in 10 or 12 countries, and it presents an enormous threat to our friends, to the world, to America, long term, and we must have a comprehensive strategy to help reject this kind of extremism."